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Related-Party Transactions - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Related Party Transactions [Abstract] |  |  |  |
Annual base management fee, in percentage of stockholders' equity, in excess of recorded value of preferred stock |  |  |  | 1.00%land_AnnualBaseManagementFeeInPercentageOfStockholdersEquityInExcessOfRecordedValueOfPreferredStock
Expected annual base management fee | 2.00%land_PercentageOfExpectedAnnualBaseManagementFeeToAggregateStockholdersEquity |  | 2.00%land_PercentageOfExpectedAnnualBaseManagementFeeToAggregateStockholdersEquity |
Pre-incentive quarterly fee FFO in percentage of common stockholders equity that will reward the advisor | 1.75%land_IncentiveFeePerAdvisoryAgreement |  |  |
Pre-incentive annual fee FFO in percentage of common stockholders equity that will reward the advisor | 7.00%land_AnnualizedIncentiveFeePerAdvisoryAgreement |  |  |
Amount to be paid to Adviser in percentage of pre-incentive fee condition one | 100.00%land_AmountToBePaidToAdviserInPercentageOfPreIncentiveFeeConditionOne |  |  |
Pre-incentive fee in percentage of common stockholders equity that awards adviser hundred percent of amount of pre-incentive fee, maximum percentage | 2.1875%land_PreIncentiveFeeInPercentageOfCommonStockholdersEquityThatAwardsAdviserHundredPercentOfAmountOfPreIncentiveFeeMaximumPercentage |  |  |
Adviser will receive 100% of the amount of the pre-incentive fee FFO annually that exceeds the hurdle but less than | 8.75%land_MaximumAnnualPercentageOfAdjustedStockholdersEquityToPayFullPreIncentiveFeeToAdviser |  |  |
Amount to be paid to Adviser in percentage of pre-incentive fee condition two | 20.00%land_AmountToBePaidToAdviserInPercentageOfPreIncentiveFeeConditionTwo |  |  |
Pre-incentive fee in percentage of common stockholders' equity that awards the adviser 20% of the amount of the pre-incentive fee, minimum percentage | 2.1875%land_PreIncentiveFeeInPercentageOfCommonStockholdersEquityThatAwardsAdviserTwentyPercentOfAmountOfPreIncentiveFeeMinimumPercentage |  |  |
Increase in percentage of fee paid to administrator | 98.00%land_IncreaseDecreaseInPercentageOfAdministrativeFee | 137.00%land_IncreaseDecreaseInPercentageOfAdministrativeFee |  |

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- Definition Amount to be paid to adviser in percentage of pre incentive fee condition one. + References No definition available. + Details
Name: | land_AmountToBePaidToAdviserInPercentageOfPreIncentiveFeeConditionOne
Namespace Prefix: | land_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount to be paid to adviser in percentage of pre incentive fee condition two. + References No definition available. + Details
Name: | land_AmountToBePaidToAdviserInPercentageOfPreIncentiveFeeConditionTwo
Namespace Prefix: | land_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Annual base management fee in percentage of stockholders equity in excess of recorded value of preferred stock. + References No definition available. + Details
Name: | land_AnnualBaseManagementFeeInPercentageOfStockholdersEquityInExcessOfRecordedValueOfPreferredStock
Namespace Prefix: | land_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Annualized incentive fee per advisory agreement. + References No definition available. + Details
Name: | land_AnnualizedIncentiveFeePerAdvisoryAgreement
Namespace Prefix: | land_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Incentive fee per advisory agreement. + References No definition available. + Details
Name: | land_IncentiveFeePerAdvisoryAgreement
Namespace Prefix: | land_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Increase decrease in percentage of administrative fee. + References No definition available. + Details
Name: | land_IncreaseDecreaseInPercentageOfAdministrativeFee
Namespace Prefix: | land_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum annual percentage of adjusted stockholders equity to pay full pre incentive fee to adviser. + References No definition available. + Details
Name: | land_MaximumAnnualPercentageOfAdjustedStockholdersEquityToPayFullPreIncentiveFeeToAdviser
Namespace Prefix: | land_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of expected annual base management fee to aggregate stockholders equity. + References No definition available. + Details
Name: | land_PercentageOfExpectedAnnualBaseManagementFeeToAggregateStockholdersEquity
Namespace Prefix: | land_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Pre incentive fee in percentage of common stockholders equity that awards adviser hundred percent of amount of pre incentive fee maximum percentage. + References No definition available. + Details
Name: | land_PreIncentiveFeeInPercentageOfCommonStockholdersEquityThatAwardsAdviserHundredPercentOfAmountOfPreIncentiveFeeMaximumPercentage
Namespace Prefix: | land_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Pre incentive fee in percentage of common stockholders equity that awards adviser twenty percent of amount of pre incentive fee minimum percentage. + References No definition available. + Details
Name: | land_PreIncentiveFeeInPercentageOfCommonStockholdersEquityThatAwardsAdviserTwentyPercentOfAmountOfPreIncentiveFeeMinimumPercentage
Namespace Prefix: | land_
Data Type: | num:percentItemType
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- Details
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